The D4SLN4NFAD is a guard lock safety-door switch designed for monitoring and securing access to hazardous areas. It features a 6-contact configuration (2NC/1NO for door detection and 2NC/1NO for lock monitoring) and a mechanical lock that is released by a 24VDC solenoid. This model is constructed with a resin head, includes an M20 conduit outlet, and has a 24VDC orange LED indicator for clear status visualization. With a minimum key holding force of 1,300 N and certified direct opening mechanisms on NC contacts 11-12 and 21-22, it provides robust safety interlocking. The switch is rated IP67, making it suitable for various industrial applications where reliable door locking and position monitoring are critical.